is expected to theunce that it's lowering its forecast for world growth to 3% this year. two days before the first presidential debate a new poll irsthe "washington post" finds pe race still very tight nationwide with president obama leading mitt romney by two rints, 49% to 47%. but in two of the biggest swing tes thatthe states that will decide the election, the resident has a bigger lead. in florida, a quinnipiac university/cbs news/"new york times" poll has the president ahead by nine points, 53% to 44%. in ohio he leads governor romney by ten points, 53% to 43%. john dickerson is our cbs news political director. jo john, some republicans are areplaining these polls aren't ren'ting an accurate picture. do they have a case? se reporter: well, they have a >>se when they remind us that polls are a snapshot in time and that things can change. howly what we should look at in polls is the trends and how things are moving over time, the orrrents. and right now those favor barack obama. the polls are really more like a painting than they are a digital photograph. one of the ot